Sippy cup base



FIG. 1 is a perspective view of a sippy cup base showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a first side view thereof;

FIG. 5 is another side view thereof, opposing the first side view;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines shown in the drawings illustrate environment and form no part of the claimed design. 

CLAIM We claim the ornamental design for a sippy cup base, as shown and described. 